Chaining ADG3308

Hi Karol, 

Why do you need a level translator when you are interfacing with two 1.8 V logic boards? What connector are you using with a 3.3 V logic?

Best regards,
Christian

Hello Christian,

Sorry for late reply.

It's a custom 3.3V control system with interchangeable mezzanine cards. Some time ago we changed carrier board, using 1.8V FPGA bank, but we needed to use ADG3308 to shift to 3.3V to be compliant with existing boards.

Now, the Client wants to introduce new mezzanine card, that we design from scratch, and we have 1.8V logic there, but cannot use 1.8V directly, in case someone puts old 3.3V card in the slot.

Hi Karol,

What are the VINH/VINL and VOH/VOL levels of the mezzanine cards that you are using at 3.3 V and 1.8 V logic and the FPGA at 1.8 V logic?

Best regards,
Christian

Hi Karol,

What are the VINH/VINL and VOH/VOL levels of the mezzanine cards that you are using at 3.3 V and 1.8 V logic and the FPGA at 1.8 V logic?

Best regards,
Christian